本文論證了系統方案的選取，闡述了系統的總體功能、設計框架。重點分析了系統各功能模塊的硬件和系統軟件的解決方案，硬件平臺由最小單片機系統、整形電路、分頻電路、LCD顯示電路四部分組成；軟件部分包括主程序、LCD顯示子程序、數據處理子程序。最後對系統性能進行測試，實驗結果表明，該系統性能穩定，可靠性高。
In order to overcome the traditional frequency measurement method can not meet the precision requirements of shortcomings, proposed one kind based on the AT89C51 of equal precision frequency measurement system design.
This paper discussed the system plan selection, expounds the system function, design framework.Focus on the analysis of the various functional modules of the system hardware and system software solutions, hardware platform by the smallest single-chip system, shaping circuit, a frequency dividing circuit, LCD display circuit is composed of four parts; part of the software includes a main program, LCD display subroutine subprogram, data processing.Finally, we test the performance of this system, the experimental results show that, the system has a stable performance, high reliability.